Free Online Chess Study Courses

Chess Course Resources Online 

Chess Books (Free)

Chess Teaching Manual by IM Tom O'Donnell -303 page PDF
    (Produced by the Chess Federation of Canada)

A Course In Chess Tactics by Dejan Bojkov, Vladimir Georgiev - 193 Page PDF

Chess Visualization Course - Book 1: General Tactics by Ian Anderson - 328 Page PDF

Silman's Complete Endgame Course - 543 Page PDF

101 Essential Chess Tips - 101 Page PDF

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Chess.com - Chock full of Free Beginner lessons.

Chessable Free Courses - Over 100 Free Courses. You set up an account and you can use any 5  FREE courses at one time. Also allows the use of Movetrainer.
(Hands Down one of the best Free Resources Online for Chess Study)  

Lichess Learn -  Lichess (Everything here is free) full of videos, interactive lessons and study plans.

Predator at the Chessboard - A field guide to chess tactics. Lots of Lessons on tactics with practical examples and quiz's. This is a really nice free site for anyone wanting to improve their tactics.

How to Get to 1900 - (A Rapid Improvement Chess Course for all Class Players)
by John Coffee
15 Steps From Intro - 1900. Each Step is broken into 3-5 parts.(Tactics, Opening, Endgame, Critical Positions and Reviewing Games) There is a great Deal of free info here for anyone trying to improve with Hundreds of problems and Lessons.

Building Chess Habits
 -  (Link is to 31 Video Playlist) A course on Improvement from 400 ELO - 2000 ELO    
31 Videos with over 60 Hours of FREE instruction by GM Aman Hambleton

Beginner Lessons

Chesskid.com  -  Offers Instruction to help Kids learn Chess (Lessons and Videos Very nice)
Chess Lab  - Basics are covered
US Chess Federation Beginner Course
Chess Corner Learn Chess Guide - Bunch of Very nice lessons right up to intermediate stuff.

Home of the Free Chess Course

ChessCourse.com - Beginner Course - 28 Lessons
ChessCourse.com - Intermediate Course - 30 Lessons

Pretty General Lessons for the Beginning Player